Throttle and pressure control



L. A. PHILLIPS THROTTLE AND PRESSURE CONTROL 6 4 9 1 0 3 flu Filed Aug. 12, 1945 2 Sheets-Sheet 1 D Em) April 30, 1946. L. A. PHILLIPS 2,399,565

' THROTTLE AND PRESSURE CONTROL Filed Aug. 12, 1945 2 Sheets-Shee t 2 1 Patented Apr. 30, 1946 UNITED STATES PATENT- OFFICE- 'rnno'r'rta AND PRESSURE CONTROL Lee A. Phillips, Clayton, N. Y.

Application August 12, 1943, Serial No. 498,365

Claims. ((160-545) v This invention relates to a throttle control and pressure regulator especially for use in controlling the speed of engines operatively connected to centrifugal pumps or other power sources employin throttle control, as in fire engines or fire-fighting equipment, or for remote control of motion without use of rods, levers, joints, or the like other than terminal attachments, yet permitting micrometer adjustment and being positive and smooth in operation.

A particular object is to provide such an apparatus as will maintain constant pressure in centrifugal pumps employed for fire fighting, without the use of automatic" release valves or other means which must be set each time pressure is raised or lowered. The structure is adapted for unitary connection with throttle control means to maintain pump pressures, in pumps or other pressure-producing machines, synchronized with the opening of the throttle, maintaining constant speeds, and in connection with centrifugal pumps maintaining constant pressure.

The more specific objects and advantages will become apparent from a consideration of the de scription following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings:

Figure 1 is a view showing the improvements partly in central longitudinal section and partly in elevation;

Figure 2 is an enlarged view of the lefthand portion of Figure 1;

Figure 3 is an enlarged view primarily in central vertical section of the righthand portion of Figure 1;

Figure 4 is a fragmentary elevation in continuation of the right of Figure 1 through the connectlon to the throttle of a carburetor; and

Figure 5 is a detail section taken on the line t-% of Figure 4.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, my improvements are adapted to be suitably mounted as by connection to sheets or walls it and ll of a fire engine, fire-fighting equipment, or other apparatus to be controlled, and the operating internalcombustion en ine of which employ a carburetor l2 employing a throt tle valve mechanism including a rockshaft it, a crank it extending therefrom to which is connected an accelerator rod construction it which is usual or conventional, consisting of rods ill and ill, the former being pivoted to crank it and the latter being slidable on the rod it to the extent permitted by a loop l8 surrounding the same, by an abutment nut l9 adiustably mounted on screw threads 20 of the rod section it.

The connection i5 is adapted for pivotal connection in one of the openings 2i of a control lever 20'.

till

A cylinder or housing 22 is fastened at 23 to the wall it, while a cylinder 24 is fastened at 25 to the wall ll. A flexible tube 26, for instance of copper, extends loosely through an inner end closure 21 of the casing 22 and through openings 28 and Eli in the wall Ill and cylinder 2t respectively. In the casing 22 flexible tubing 26 is connected to and communicates with the interior of an expansible bellow till which preferably is metallic and a Sylphon bellows. At the other end flexible tubing 26 is fastened fluid tight to a tube 3i mounted by a cap or casing 32 having a flange t3 clamped in place between cylinders 2t and an end plate t l thereon, screwed in place as at W.

Said tube 3i extends interiorly into the cup 32, and a Sylphon bellows 36 of the same general construction and material as that at it is secured at its inner end to and located within the cup. Such bellows has a rigid disc or end plate 31! thereon provided with an inwardly extending stem it having a chamber 39 in slidable liquidtight engagement with the tube 3 l.

Extending from the other end of the stem 38 is a screw rod or stud Bil slidable through an opening ill in the end plate at, and which is adjustably screw-threaded to a link M which is pivoted by a bolt M or the equivalent in one of the openings 2i of the lever 20'. Such lever is pivoted by a bolt or the like at its top at it to an arm M extending from the end plate t l. The movement of said lever 20' is limited since it moves in the slot ill of a yoke til, also extending from the end plate, t l; the shoulder ll in said slot and a pin it therein serving as stops at the extremes of movement of the lever.

The interior of the bellows tit, tubing 2t, tube at, and chamber 39 are evacuated and filled with a non-freezing liquid, for instance turpentine, and then sealed. Thus there will be no voids in the parts mentioned, and any pressure exerted on the outer end or head M of the Sylphon bel- 10Ws till will compress that bellows, displacing the liquid or fluid and causing the Sylphon bellows at to slide at the chamber 39 on the tube 3 i, thereby sliding the connection 39', rocking lever Ell, moving the linkage l5, and actuating or controlling the throttle valve of the carburetor through its shaft it. The air within bellows 3b is compressed by such movement. In the absence of pressure at the lefthand end of Sylphon bellows til the same will be restored to normal position i and maintained therein, through its inherent expansion and inherent expansion of the bellows 3t and the expansion of the previously compressed air within the bellows.

A suitable crosshead 50 is mounted to slide in the casing 22 to the extent limited by lugs til extending inwardly of said casing. Head of disc lll provides a seat for a projection 52 on the cross head 50. An expansive coil spring 53 is disposed bracket 13 extending from the end wall 62.

in the casing 22 and at one end abuts the crosshead 50 and at the other end abuts a follower or disc 64 which is slidable in the cylinder 22.

A bracket 66 is fastened by certain of the bolts 23 to the wall l and cylinder 22. An operating lever 51 by means of a short shaft 66 is Journaled in the side walls of bracket 66 and is movable in an are through a slot 66 of the bracket. The lever 68 carries a cam 60 thereon within the bracket which is in peripheral contact at all times with the follower 64. The lever 61 will be maintained in any position of adjustment by the engagement of cam 60 and follower 64 in view of action of the spring 63.

An auxiliary cylinder 6| is suitably fastened to the wall l6 below the casing 22, having an inner end wall 62 suitably fastened thereto. A cup or housing 63, similar to that employed at 32, is fastened in place between the housing 6i and closure 62, and mounted therein is a bellows 64 preferably a Sylphon bellows like that employed at 30. This bellows is of the specific construction employed at 36, having an end disc at 66 from which an inwardly extending stem 66 projects. A stud or connection 61 is screw threaded at 68 to the stem 66, slides through an opening 66 in the end wall 62, and at 10 is pivoted to an equalizing lever II, in turn pivoted at 12 to a At the upper end said equalizing lever H is pivoted at 14 to the crosshead 66, the latter having sufflcient. clearance as at 16 for operation of the equalizing lever.

A fitting 16 is secured to the cup 63 and has a passage 11 therethrough in communication with a chamber 18 in the stem 66 through the medium of a tube or projection 16 on which the bellows is slidable at the chamber 16. Connected to the fitting l6 and also communicating with its passage I1 is a flexible tube 60 which is adapted for connection to the centrifugal pump which is operated by the internal combustion engine of which the carburetor l2 forms a part.

Since bellows 64 is connected to the centrifugal pump, the action or motion of pressure built up by the pump compresses that bellows 64 and forces the stud 61' outward. Since the latter is connected to lever II and crosshead 50, pressure is placed on the spring 63, which retards pressure against the bellows 30, which in turn retracts the bellows 36 and closes the throttle. The closing of the throttle slows down the motor, and thus pressure generated in the pump is lessened. This balanced operation keeps the pressure at a point synchronized with the position of the lever 61.

The .pressure control on fire pumps in particular is important, especially where they use centrifugal pumps. For example, when two lines of hose are being used and one line is shut off, the volume of water being pumped would be forced through a single line at a higher pressure and might result in injury to nozzle-men. Also when a portion of the volume of output is shut off the pump has a tendency to race, which might result in the motors speeding above a safe R. P. M. peak. As a result of the invention, it thus will be seen that as the speed of the motor is brought to the desired pump-working pressure, the pressure control is automatically set, and if all flow from the pump were closed off the motor speed would not vary.

Drain valve devices may be employed as at 96, in connection with the cup 63.

I claim as my invention:

1. Afluid transmission control of the class described, comprising, a bellows, a flexible connection leading from the bellows and Jointly therewith containing fluid, actuating expansible chamber motor means connected to said connection for actuation by said fluid, and a connection to compress the bellows to move the fluid, comprising a bellows, a spring, slidable means between said spring and first-mentioned bellows, and equalizing lever means between the slidin means and the second-mentioned bellows.

2. A fluid transmission control of the class described comprising, a bellows, a flexible connection leading from the bellows and Jointl therewith containing fluid, actuating expansible chamber motor means connected to said con. nection for actuation by said fluid, and a connection to compress the bellows to move the fluid, comprising a bellows, a spring, slidable means between said spring and first-mentioned bellows, and equalizing lever means between the sliding means and the second-mentioned bellows, a follower engaged against the spring, and means adjustably to secure the follower in different positions.

3. A fluid transmission control of the class described comprising, a bellows, a flexible connection leading from the bellows and jointly therewith containing fluid, actuating expansible chamber motor means connected to said connection for actuation by said fluid, and a connection to compress the bellows to move the fluid, com- .prising a bellows, a spring, slidable means between said spring and first-mentioned bellows, and equalizing lever means between the sliding means and the second-mentioned bellows, a follower engaged against the spring, and means ad- Justably to secure the follower in different positions, comprising a lever and cam means controlled by the lever and directly engaged with the follower.

4. A fluid transmission control of the class described, comprising, a bellows, a flexible connection leading from the bellows and jointly there. with containing fluid, actuating expansible chamber motor means connected to said connection for actuation by said fluid, and a connection to compress the bellows to move the fluid, comprising a bellows, a spring, slidable means between said spring and first-mentioned bellows, and equalizing lever means between the sliding means and the second mentioned bellows, said sliding means comprising a crosshead to which the lever is directly pivoted, a casing in which the crosshead, spring, and first-mentioned bellows are mounted, said casing having stop means thereon for the crosshead.

5. A fluid transmission control of the class described comprising, a bellows, a flexible connection leading from the bellows and jointly therewith containing fluid, actuating expansible chamber motor means connected to said connection for actuation by said fluid, and a connection to compress the bellows to move the fluid, comprising a bellows, a spring, slidable means between said spring and first-mentioned bellows, and equalizing lever means between the sliding means and the second-mentioned bellows, a cup enclosing the second-mentioned bellows mounting a tube, said bellows having a stem provided with a chamber in communication with the tube and slidably mounting the second-mentioned bellows, and a connection direct from said stem to 

